I noticed that my battery light was on upon startup after I did a bunch of things to my car. I read a thread that recommended revving the engine to activate the alternator and get the light to go out. I already understand that the blue wire basically activated the alternator upon ignition.
I tested the wire in that position and when the car was running before I revved it and I got a very low reading of only a couple volts. After revving the engine passed 1200 RPM, I checked again and it was above 12v.
I did some research in other threads and on other sites and see that this is somewhat common for MKII vehicles. However, unless it is a matter of the wire being unplugged or missing, most people seem to just let it be and rev the engine. I consider that a temporary fix at best.
Has anyone fixed this themselves or have any ideas?